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I was searching on the internet but I can't find any result, even saying that I can't use it.
I have the following cameras: a Sony a7R II and a Nikon D610. I'm able to find adapters to use my Nikon's FX lenses on my Sony E mount, but I cannot find any adapter to use my Sony's E mount lenses on my Nikon D610 camera. It is possible to achieve this?
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
In your search of adapters, you probably found two types:
Those without simply act as spacers, bringing the flange focal distance up to that of the design for the lens. For example, the Sony A7RII has a FFD of 18mm while the Nikon F mount has an FFD of 46.5mm.
This means that any Sony-> Nikon mount need simply space the lens 46.5mm from the sensor in order to "fit" it to the camera.
If working the other way around, you can see the obvious problem: Sony mount lenses are meant to be closer to the sensor than you can physically add them on a Nikon. This is similar to using an extension tube with a normal F-mount lens - namely, focus can be achieved at certain distances but focusing to infinity is impossible.
In order to compensate for this, the adapters may use additional lenses to further tweak the light making it's way to the sensor. While they will account for the focal distances, they are generally of sub-optimal quality and rob you of image quality such that the general recommendation is: if using a lensless adapter: go for it. If using an adapter with a lens: forget-about-it...the loss in image quality is simply not worth it.
The Sony E mount lenses for their mirror less cameras have a flange focal distance (found that on Wikipedia but sounds wrong to me :-) of 18mm which means it cannot be mounted close enough to the D610's sensor no matter the adapter.
So the answer is that it is not possible to achieve.
